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參數(shù)資料
| 型號： | 5962-8963701CX |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬專用變換器 |
| 英文描述： | RMS TO DC CONVERTER, 0.15 MHz, CDIP14 |
| 封裝： | CERDIP-14 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 515K |
| 代理商： | 5962-8963701CX |
AD637
Rev. G | Page 15 of 20
dB CALIBRATION
Refer to Figure 19:
Set VIN = 1.00 V dc or 1.00 V rms
Adjust R1 for 0 dB out = 0.00 V
Set VIN = 0.1 V dc or 0.10 V rms
Adjust R2 for dB out = 2.00 V
Any other dB reference can be used by setting VIN and R1
accordingly.
LOW FREQUENCY MEASUREMENTS
If the frequencies of the signals to be measured are below
10 Hz, the value of the averaging capacitor required to deliver
even 1% averaging error in the standard rms connection
becomes extremely large. Figure 20 shows an alternative
method of obtaining low frequency rms measurements. The
averaging time constant is determined by the product of R and
CAV1, in this circuit 0.5 s/F of CAV. This circuit permits a 20:1
reduction in the value of the averaging capacitor, permitting the
use of high quality tantalum capacitors. It is suggested that the
two-pole, Sallen-Key filter shown in Figure 20 be used to obtain
a low ripple level and minimize the value of the averaging
capacitor.
If the frequency of interest is below 1 Hz, or if the value of
the averaging capacitor is still too large, the 20:1 ratio can be
increased. This is accomplished by increasing the value of R. If
this is done, it is suggested that a low input current, low offset
voltage amplifier, such as the AD548, be used instead of the
internal buffer amplifier. This is necessary to minimize the
offset error introduced by the combination of amplifier input
currents and the larger resistance.
VECTOR SUMMATION
Vector summation can be accomplished through the use of two
AD637s, as shown in Figure 21. Here the averaging capacitors
are omitted (nominal 100 pF capacitors are used to ensure
stability of the filter amplifier), and the outputs are summed as
shown. The output of the circuit is
2
Y
X
O
V
+
=
This concept can be expanded to include additional terms by
feeding the signal from Pin 9 of each additional AD637 through
a 10 k resistor to the summing junction of the AD711 and
tying all of the denominator inputs (Pin 6) together.
If CAV is added to IC1 in this configuration, the output is
2
Y
X
V
+
If the averaging capacitor is included on both IC1 and IC2, the
output is
2
Y
X
V
+
This circuit has a dynamic range of 10 V to 10 mV and is
limited only by the 0.5 mV offset voltage of the AD637. The
useful bandwidth is 100 kHz.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 5962-89640012A | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| 5962-89641012A | 制造商:Analog Devices 功能描述:OP Amp Single GP ±18V 20-Pin LCC 制造商:Analog Devices 功能描述:OP AMP SGL GP 18V 20PIN LCC - Rail/Tube 制造商:Analog Devices Inc. 功能描述:Precision Amplifiers FAST SETTLING HS IC |
| 5962-8964101CA | 制造商:Analog Devices 功能描述:OP Amp Single GP ±18V 12-Pin TO-8 制造商:Rochester Electronics LLC 功能描述:FAST SETTLING H.S. OP AMP - Bulk |
| 5962-89642012A | 功能描述:運(yùn)算放大器 - 運(yùn)放 HIGH OUTPUT CURRENT IC RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 共模抑制比（最小值）:120 dB 輸入補(bǔ)償電壓:6 V 輸入偏流（最大值）:1400 pA 工作電源電壓:4 V to 36 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 轉(zhuǎn)換速度:0.8 V / us 關(guān)閉:No 輸出電流: 最大工作溫度:+ 125 C 封裝:Reel |
| 59628964201CA | 制造商:AD 功能描述:5962-8964201CA |
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